<script setup>
import { ref, watch } from "vue";
import { defineProps } from "vue";
import { useMouseInElement } from "@vueuse/core";
// 图片列表
const props= defineProps({
    imageList:{
        type:Array,
        default:()=>[]
    }
})
const activeIndex=ref(0)
const enterhandler=(i)=>{
console.log('鼠标进入' ,i)
activeIndex.value=i
}
const target = ref(null);
const left=ref(0)
const top=ref(0)
const positionX=ref(0)
const positionY=ref(0)
const { elementX, elementY, isOutside } = useMouseInElement(target);
watch([elementX,elementY,isOutside],()=>{
    //console.log('xy变化了')
    if(isOutside.value) return
    if(elementX.value>100&elementX.value<300){
        left.value=elementX.value-100
    }
    if(elementY.value>100&elementY.value<300){
        top.value=elementY.value-100
    }
   if(elementX.value>300){left.value=200}
   if(elementY.value>300){top.value=200}
   if(elementX.value<100){left.value=0}
   if(elementY.value<100){top.value=0}
   positionX.value=-left.value*2

   positionY.value=-top.value*2
})
</script>


<template>
   
  <div class="goods-image">
    <!-- 左侧大图-->
     
    <div class="middle" ref="target">
      <img :src="imageList[activeIndex]" alt="" />
      <!-- 蒙层小滑块 -->
      <div class="layer" :style="{ left: `${left}px`, top: `${top}px` }" v-show="!isOutside"></div>
    </div>
    <!-- 小图列表 -->
    <ul class="small">
      <li v-for="(img, i) in imageList" :key="i" @mouseenter="enterhandler(i)" :class="{active:activeIndex===i}">
        <img :src="img" alt="" />
      </li>
    </ul>
    <!-- 放大镜大图 -->
    <div class="large" :style="[
      {
        backgroundImage: `url(${imageList[activeIndex]})`,
        backgroundPositionX: `${positionX}px`,
        backgroundPositionY: `${positionY}px`,
      },
    ]" v-show="!isOutside"></div>
  </div>
</template>

<style scoped lang="scss">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;

  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
  }

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    z-index: 500;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    // 背景图:盒子的大小 = 2:1  将来控制背景图的移动来实现放大的效果查看 background-position
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }

  .layer {
    width: 200px;
    height: 200px;
    background: rgba(0, 0, 0, 0.2);
    // 绝对定位 然后跟随咱们鼠标控制left和top属性就可以让滑块移动起来
    left: 0;
    top: 0;
    position: absolute;
  }

  .small {
    width: 80px;

    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid $xtxColor;
      }
    }
  }
}
</style>